salicylic acid

a white, crystalline, very slightly water-soluble powder, C 7 H 6 O 3 , prepared from salicin or phenol: used as a food preservative, in the manufacture of aspirin, and in medicine chiefly in the form of a salicylate as a remedy for rheumatic and gouty conditions.

(sāl'ĭ-sĭl'ĭk) A white, crystalline acid used to make aspirin, to treat certain skin conditions, and to preserve and flavor foods. Salicylic acid is benzoic acid with a hydroxyl group (OH) attached to the carboxyl group (COOH). Chemical formula:C7H6O3.